Portable computer



FIG. 1 is an isometric view of a portable computer showing our new design, where the top portion of the portable computer is in an open position;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a portable computer, as shown and described. 